说明：  设计一个学生成绩管理系统 ? ⑴有学号,姓名,班级,成绩字段 ? ⑵初始化一个班级(35人)的基本信息 ? ⑶统计60分以下,60～70,70～80,80～90,90分以上学生信息 按四个字段查询并列出学生信息 ? ⑷按学生成绩高到低,低到高进行排序.
(Students design a performance management system ? ⑴ a student number, name, class, performance field ? ⑵ initialize a class (35 people) of the basic information ? ⑶ Statistics 60 points or less, 60 ~ 70,70 ~ 80, 80 to 90,90 points or more student information by four students in the field and lists the information query ? ⑷ by high to low student achievement, low to high order.)